An instrument which indicates a line parallel to the plane of the horizon, used in determining the position as to horizontality of a surface to…

A tool or instrument working on the principle of the spirit level, in which water, typically in a straight tube or the arms of a U-tube, is used…

In material senses. A level (the instrument). Obsolete.

An instrument or device consisting of a sealed transparent tube filled with alcohol or other liquid and containing an air bubble whose position…

a level in which the horizontal line is determined by perpendicularity to a plumb line.

a levelling instrument in which the position of a bubble in a transparent fluid-filled tube shows whether it is horizontal; = spirit level, n.

the common spirit-level, used with a telescope or theodolite resting on Y's (also written wye-level).

striding level: a spirit-level supported at both ends so as to straddle over intervening projections. So striding stand.